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Mailbird vs Spark Mail: catalog facts
Mailbird	Spark Mail
Paid Paid desktop app, sold as a one-time or subscription license.	Freemium Free for individuals; paid plans add AI features and team tools.
Windows, macOS	Windows, macOS, Android, iOS
Unifies multiple email accounts and providers into one inbox App integrations reduce the need to switch to separate tools	Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses
Windows and macOS only Full feature set requires a paid license	AI and team features are gated behind a paid plan Some categorization requires manual correction over time
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.